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Corriente del Golfo: fluctuaciones de velocidad durante el Cenozoico tardío
Science (New York, N.Y.)
|April 20, 1979
Resumen
Los núcleos de sedimentos de la meseta Blake revelan una historia de cambios en las corrientes oceánicas. Fluctuaciones en la Corriente del Golfo
Área de la Ciencia:
- Geología marina Geología marina.
- La paleoceanografía es la paleoceanografía.
- La bioestratigrafía es una estratigrafía biológica.
Sus antecedentes:
- El registro sedimentario de la meseta Blake ofrece información sobre las condiciones oceanográficas pasadas.
- Comprender los cambios en el nivel del mar y la dinámica actual del océano es crucial para la reconstrucción del clima.
Objetivo del estudio:
- Para analizar la biostratigrafia del sureste de la meseta de Blake.
- Para reconstruir la historia paleoceanográfica, centrándose en las fluctuaciones de velocidad de la Corriente del Golfo.
Principales métodos:
- Análisis biostratigráfico de siete núcleos de pistón.
- Identificación de las interrupciones que indican períodos de no deposición o erosión.
Principales resultados:
- La sección sedimentaria muestra una alternancia de deposición y erosión por el oozo calcáreo.
- Los hiatos, que indican las fases de alta velocidad de la Corriente del Golfo, ocurrieron en 4.86.1, 3.94.4, 2.32.9 y 01.5 millones de años BP.
- Las aceleraciones de la Corriente del Golfo se correlacionan con el enfriamiento climático global y los eventos de glaciación.
Conclusiones:
- Los cambios de velocidad de la Corriente del Golfo a largo plazo impactaron significativamente la sedimentación en la meseta Blake.
- Los eventos paleoceanográficos, incluida la glaciación y la aparición del istmo de Panamá, influyeron en la dinámica de la Corriente del Golfo.
- El estudio vincula los registros sedimentarios con los principales cambios climáticos y eventos tectónicos.
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